Equidigital Number

A number n is called equidigital if the number of digits in the prime factorization of n (including powers) uses the same number of digits as the number of digits in n. The first few equidigital numbers are 1, 2, 3, 5, 7, 10, 11, 13, 14, 15, 16, 17, 19, 21, 23, ... (OEIS A046758).

See also

Economical Number, Wasteful Number

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Pinch, R. G. E. "Economical Numbers.", B. R. "Problem 2204. Equidigital Representation." J. Recr. Math. 27, 58-59, 1995.Sloane, N. J. A. Sequence A046758 in "The On-Line Encyclopedia of Integer Sequences."

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Equidigital Number

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Weisstein, Eric W. "Equidigital Number." From MathWorld--A Wolfram Web Resource.

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